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Last Updated on: Thursday, April 07, 2016 02:04 PM

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Latch Circuits
 

Low Voltage Latch Circuit  -  A Discover Circuits visitor wanted a simple on/off latch circuit which can turn on and off power to a small motor.  The kicker was that he wanted to power the circuit and the motor from a single 1.2v NiMH battery cell.  Texas Instruments comes to the rescue with their family of low voltage single gate ICs.  Specifically the SN74AUP1Q14 Schmitt trigger inverter will operate down to 0.8v and lower.  When used with a good NPN transistor, the circuit below works quite nicely . . . [Circuit by David A. Johnson P.E.,  03/01/13]


Low Voltage Latching Relay Driver  -  Using some small super capacitors, this circuit can latch and unlatch a mechanical relay with 10 Amp contacts, from a small 3 volt power source.  By using a latching relay, power can be controlled to a load with a tiny battery . . . [Circuit by Dave Johnson P.E.,  08/13/06]

On/Off Latch Circuit  -  Often you want to turn on and off power to a device with a single pushbutton switch.  The circuit below performs this logic function with just a few parts and can operate from DC supplies between +3v to about 15v.  It uses two inverters within a 74C14 or a CD4069 hex inverter package.  Each press of the button toggles between the two on/off logic states. . . . [Circuit by Dave Johnson P.E.,  01/09/10]


On/Off Latch Circuit with 2 Second Delay  -  A Discover Circuits visitor needed a latch circuit which could operate using a power supply voltage ranging from 3v to 24v.  He wanted to use a tiny pushbutton switch to turn on and off power to a load.  However, he wanted a 2 second delay between the switch activation and the state change of the output . . . [Circuit by David A. Johnson P.E.,  06/30/13]


On/Off Switch With Latching Relay  -  The circuit below switches AC or DC power to a load using an ultra low power 3v latching relay with two coils.  The relay can handle about 10 Amps of current, up to 250vac.  Each time the small pushbutton is pressed, the circuit either latches the relay . . . [Circuit by Dave Johnson P.E.,  12/24/09]


Press and Hold Latching Circuit  -  A Discover Circuits visitor needed a latch circuit which could operate using a power supply voltage ranging from 3v to 24v.  He wanted to use a tiny pushbutton switch to turn on and off power to a load.  However, he wanted a 2 second delay between the switch activation and the state change of the output . . . [Hobby Circuit designed by David Johnson P.E.,  06/30/13]


Pushbutton Oneshot & Latch  -  This circuit uses a single IC to convert a noisy pushbutton switch signal into a clean pulse or a sustained push on-push off signal. It can operate from 3v to 18v . . . [Circuit by Dave Johnson P.E.,  03/26/02]


Pushbutton On-Off Latch Circuit  -  Often you want to turn on and off power to a device with a single pushbutton switch.  The circuit below performs this logic function with just a few parts and can operate from DC supplies between +3v to about 15v.  It uses two inverters within a 74C14 or a CD4069 hex inverter package.  Each press of the button toggles between the two on/off logic states. . . . [Hobby Circuit designed by David Johnson P.E.,  01/09/10]


Super Capacitor makes Low Voltage Latching Relay Driver  -  Using some small super capacitors, this circuit can latch and unlatch a mechanical relay with 10 Amp contacts, from a small 3 volt power source.  By using a latching relay, power can be controlled to a load with a tiny battery . . . [Hobby Circuit designed by Dave Johnson P.E.,  08/13/06]


Switches AC or DC power using a Latching Relay  -  The circuit below switches AC or DC power to a load using an ultra low power 3v latching relay with two coils.  The relay can handle about 10 Amps of current, up to 250vac.  Each time the small pushbutton is pressed, the circuit either latches the relay . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/24/09]


Ultra Low Power Latching Relay Circuit  -  The circuit below takes advantage of some inexpensive small super capacitors.  The circuit pumps 6 volt pulses into the separate 5 volt latching and unlatching relay coils.  A short 25ms pulse is all that is needed to flip the relay states.  A third super capacitor is used to supply a higher peak current than a small lithium cell might otherwise be able to supply . . . [Circuit Solution by Dave Johnson P.E.,  04/29/07]


Universal Flasher Using a Latching Relay  -  Latching relays are nifty devices.  Most contain two separate coils.  When a voltage is applied to one coil the relay latches in one state and stays in that state until voltage is applied to the unlatch coil.  Since the latching and unlatching pulses only . . . [Hobby Circuit designed by David A. Johnson P.E.,  10/16/05]


Latch Circuits

Master Category List - Dave's Circuits

 


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